Anti-social ride at dusk

Just doing a bit of 'sprint' training to be honest. Started off trying to keep the HR around 150bpm, but as the legs warmed up realised could keep going at a higher rate than that, so threw that plan out of the window and just carried on at what felt like a comfortable pace.

Coming back let the HR creep up some more until finding the hills along Perimeter which are close enough to the end to just go 100%. Finished up pretty spent as a result.